Question

我有两个表格，可以通过name和dateOfInput连接自己。

表格文件

id
name
price
dateOfDocument
dateOfInput

表客户

id
identification
name
dateOfInput

我想在网格中显示的数据是这样的：

Name   |  Identification  |  Total Price  | Total Quantity
John          #1               15.31            2
Stack         #13              9.90             1

在数据库中，各表的行是：

行文档：

VALUES('John', 10.31, '2015-01-01', '2015-01-01 15:00')
VALUES('John', 5.00, '2015-01-02', '2015-01-02 13:00')
VALUES('Stack', 9.90, '2015-01-01, '2015-01-01 12:00')

行客户：

VALUES('#1', 'John', '2015-01-01 15:00')
VALUES('#1', 'John', '2015-01-02 13:00')
VALUES('#13', 'Stack', '2015-01-01 12:00')

为了完成我想要的网格，这里是我的选择：

SELECT doc.name, cust.identification, 
       SUM(doc.price) AS `totalPrice`, 
       COUNT(doc.name) AS `totalQuantity`
FROM documents AS doc
INNER JOIN customers AS cust ON cust.name = doc.name
WHERE doc.dateOfDocument >= '2015-01-01' AND
      doc.dateOfInput = cust.dateOfInput
GROUP BY doc.name

我收到的输出在价格和数量上都是错误的。

Name   |  Identification  |  Total Price  | Total Quantity
John          #1               10.31            1
Stack         #13              9.90             1

Answer 1

尝试将cust.identification添加到GROUP BY子句

Answer 2

这给了我正确的结果（注意GROUP BY更改）：

SELECT doc.name, cust.identification,
    SUM(doc.price) AS 'totalPrice',
    COUNT(doc.name) AS 'totalQuantity'
FROM mg_tblDocuments AS doc
INNER JOIN mg_tblCustomers AS cust ON cust.name = doc.name
WHERE doc.dateOfDocument >= '2015-01-01' AND
      doc.dateOfInput = cust.dateOfInput
GROUP BY doc.name, cust.identification -- add me

编辑：殴打它：）

INNER JOIN错误的SUM和COUNT

2 个答案: